. The American entomologist. Entomology. First form of trophi in Phylhcnistis viti/oliella (after Chambers). and are, therefore, structurally as capable of leaving the mine and crawling away as is the larva of oinatdla. Yet, they not only do not do so, but continue to feed in the mine, and pupate there. This, however, is apart from my present purpose. The fact, however, indicates that the develop- ment of the jaws and feet is independent. Phyllocnistis VITIFOLIELLA : <2, head of last larval stage; 1^, head of immature pupa pressed of the larval head. The difference consists not only in the
. The American entomologist. Entomology. First form of trophi in Phylhcnistis viti/oliella (after Chambers). and are, therefore, structurally as capable of leaving the mine and crawling away as is the larva of oinatdla. Yet, they not only do not do so, but continue to feed in the mine, and pupate there. This, however, is apart from my present purpose. The fact, however, indicates that the develop- ment of the jaws and feet is independent. Phyllocnistis VITIFOLIELLA : <2, head of last larval stage; 1^, head of immature pupa pressed of the larval head. The difference consists not only in the different size, form and degree of develop- ment of the different organs, but in the presence or absence (apparently) of some of the organs themselves. Thus, in the first form (Fig. 126), only labrum, mandibles and labium have been detected; the spin- neret is very rudimentary, and there is no trace of either maxillary or labial palpi, or of maxilla:.* In the second or ordinary form not only are the labrum and labium greatly altered in form and size and rela- * In the larva: of the flat group, in which the trophi of the (irst form attain their full size at the end of the fifth stage, and in which they are larger than in any other of the genera or species mentioned, their width is only l-150th uich; length about l-800th inch; and vertical thickness not more than l-2000th of an inch. The front margin of the labrum is scal- loped and downwards in the middle (Fig. 126), so that the teeth of the mandibles appear in a focal plane above the labrum, which is dentate and ciliated in some species. These facts, with the result of my first dissections (made with needles), induced me to think, and to state in the address above referred to that the ma.\illa: were united above the labium, forming. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectl
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectentomology, bookyear1
